Determination of Preload of Double-Row Tapered Roller Bearing Used for Supporting Direct-Drive Wind Turbine Rotor
Bibliographic record
Abstract
Appropriate axial preload is necessary for the double-row tapered roller bearing used for supporting the rotor of the direct-drive wind turbine; its function is to ensure the rolling motions of the rollers and the long fatigue life of the bearing as far as possible. For this purpose, statics model of the preloaded bearing under the combined action of radial load, axial load and tilting moment load was established firstly; then, for a set of selected preload values which are different proportions of the dynamic equivalent axial load of the external bearing loads, the corresponding loaded roller number, maximum roller load and bearing fatigue life were obtained; thirdly, the effects of different preloads on the calculated indicator values were analyzed, result show that preload can improve the uneven load distribution among the rollers, the preload value also influence the rolling roller number and bearing fatigue life. A preload of 0.5 times of the dynamic equivalent axial load was selected as a trade-off between the rolling roller number and bearing fatigue life.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".